Rxp 155 question

I've got a 07 rxt and I just sold my girlfriends 03 gti le to get her something faster so she can keep up at my riding groups normal cruise speed of around 53ish. The gti would only gps a honest 44 which is what it's supposed to do. Anyways I want to get her a 155 hp ski to ride. I have found a 155 rxp that matches my rxt. Do any of you guys have first hand experience on one or know what it will gps speed wise. I know it's not going to haul the mail like a 215 and that's not what I'm after here. Just something easy to maintain and will run mid 50's. Also what's the avg. GPS top speed of a GTX 155. Probably looking for a 07-08.